10/06/2026
๐๐ข๐ฆ ๐ผ๐ป ๐ฎ ๐ด๐ฒ๐ผ๐๐ฒ๐
๐๐ถ๐น๐ฒ ๐ฑ๐ฎ๐๐ฎ๐๐ต๐ฒ๐ฒ๐: ๐ช๐ต๐ฎ๐ ๐ฑ๐ผ๐ฒ๐ ๐ถ๐ ๐ฎ๐ฐ๐๐๐ฎ๐น๐น๐ ๐บ๐ฒ๐ฎ๐ป?
AOS stands for ๐๐ฝ๐ฝ๐ฎ๐ฟ๐ฒ๐ป๐ ๐ข๐ฝ๐ฒ๐ป๐ถ๐ป๐ด ๐ฆ๐ถ๐๐ฒ and is an important property when evaluating geotextiles for filtration applications.
Here's where it can get confusing:
๐ AOS can be reported using U.S. Sieve or millimeters (mm).
๐ When reported as a U.S. Sieve number, the value is a maximum allowable opening.
๐ When reported in millimeters, the value represents the smallest allowable opening.
And yesโthe numbers can seem backwards!
Carthage Mills breaks down AOS and how to read it on a geotextile datasheet.
Read the full explanation: https://carthagemills.com/geosynthetics/aos-apparent-opening-size/